2-116 Motor Control
If the value is “SAVE MOP Ref” when the drive power returns, the MOP
reference is reloaded with the value from the non-volatile memory.
When the bit is set to 0, the MOP reference defaults to zero when power
is restored. The MOP save reference parameter and the MOP rate
parameter can be changed while the drive is running.
Bit 1
0 = Reset MOP reference when STOP edge is asserted
1 = Don’t reset MOP reference when STOP is asserted (default)
Important: The MOP reset only occurs on the stop edge and is not
continuously cleared because the stop is asserted (this is always
processed when a stop edge is seen, even if the drive is
stopped). The reset only applies to the stop edge and not when a
fault is detected.
In order to change the MOP reference (increment or decrement) a given DPI
port must have the MOP mask asserted (and the logic mask asserted). In the
case of the terminal block, if the MOP increment or MOP decrement
function is assigned to a digital input, then the act of asserting either of
those inputs will cause the TB to try and gain ownership of the MOP inc/dec
reference change.
Ownership of the MOP function can be obtained even if the MOP reference
is not being used to control the drive. If ownership is granted, the owner has
the right to inc/dec the MOP reference. Whether this reference is the active
speed reference for the drive is separately selected via TB reference select,
or Ref A/B select through DPI.
The MOP Frequency parameter is an output which shows the active value of
the MOP reference in Hz x 10.
MOP handling with Direction Mode
If the Direction Mode is configured for “Unipolar,” then the MOP
decrement will clamp at zero not allowing the user to generate a negative
MOP reference that is clamped off by the reference generation. When
Direction Mode = “Bipolar” the MOP reference will permit the decrement
function to produce negative values. If the drive is configured for Direction
Mode = “Bipolar” and then is changed to “Unipolar”, the MOP reference
will also be clamped at zero if it was less than zero.
Motor Control See Torque Performance Modes on page 2-205
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